13G Filing: Nokomis Capital and Transatlantic Petroleum Ltd. (TAT)

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SCHEDULE 13G

This Schedule 13G (this “Schedule 13G”) is being filed on behalf of Nokomis Capital, L.L.C., a Texas limited liability company
(“Nokomis Capital”), and Mr. Brett Hendrickson, the principal of Nokomis Capital, relating to Common shares, par value $0.10 (the “Common Stock”), of TransAtlantic Petroleum Ltd., a Bermuda exempted company (the
“Issuer”).

This Schedule 13G relates to Common Stock of the Issuer purchased by Nokomis Capital through the accounts of certain
private funds and managed accounts (collectively, the “Nokomis Accounts”). Nokomis Capital serves as the investment adviser to the Nokomis Accounts and may direct the vote and dispose of the 4,394,083 shares of Common Stock held by the
Nokomis Accounts. As the principal of Nokomis Capital, Mr. Hendrickson may direct the vote and disposition of the 4,394,083 shares of Common Stock held by the Nokomis Accounts.

Item 1(a)

Name of Issuer.

TransAtlantic Petroleum Ltd.

Item 1(b)

Address of Issuer’s Principal Executive Offices.

16803 Dallas Parkway

Addison, Texas 75001

Item 2(a)

Name of Person Filing.

Nokomis Capital, L.L.C. (“Nokomis Capital”) and
Mr. Brett Hendrickson.

Item 2(b)

Address of Principal Business Office, or, if none, Residence.

2305 Cedar Springs Rd.,
Suite 420

Dallas, TX 75201

Item 2(c)

Citizenship or Place of Organization.

Nokomis Capital is a limited liability company
organized under the laws of the State of Texas. Mr. Hendrickson is the principal of Nokomis Capital and is a United States citizen.

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